my approach with the ladies is unique and different:
I don't bother them for one thing. I let them bother me.
I also don't buy them drinks at a sport bar. I tell the bartender to go ask them if they would like to buy me a drink. most of the time it does not work but occasionally it does. and we have a good laugh in the process.
i also try to make sure i don't ask them out as much as possible. i try to be creative.
i create the conditions and the climate where they are comfortable with me. and then they can come up with all the hints to go out.
some guys act just too desperate.
smart women don't care for desperate fools at a sports bar.